What are the 4 muscles of respiration?
Aid in inspiration by elevating the 1st & 2nd ribs.
External Intercostal muscles:
11 pairs elevate the ribs durin inspiration and increase lateral and anterioposterior dimensions of the thorax.
Internal Intercostal muscles:
11 pairs serve as antagonists to the external intercostals. They decrease the lateral and anteroposterior dimensions of the thoracic cavity by drawing adjacent ribs together during forced expiration.
Most important muscle of inspiration.